Valve



Paten ed Oc 10, 950

VALVE Johann Heinrich Hermann Voss,

. ,White Plains, N. Y.

Application April 19, 1945, Serial No. 589,182

Tllhis invention relates to valves. It is particularly directed to suction and discharge valves for compressors and the like machines.

- An-object of thisainvention is to provide a valve comprising a-cast piston or body,.a valve guard screw-ed thereto, and a .valveseat screwed to the valveguard, and .contactingthe-piston or body, the mutually contacting-Surfaces between the piston on body andvalve seat being ground, whereby to provide largest possible valve plates giving large passage area with ,low valve lift and providing a simple and safe assembly of the guard andseat.

Another object-of this invention is to provide a valve of, the character described, comprising a piston or body a v lve seat member, and a valve. guard niember, oneof the members being screwed] to the piston or body, and the second member beingscrewed to the first member. f

, A further objectof this inventionis to provide a valve construction of the character described, comprising a cast'piston or body and a. valve seat attachedv theretdthe taweseat and body having mutually contacting complementary ground surfaces.

'Yet another object of this invention is to provide a suction and discharge valve construction for a compressonwherein the suction valve seat is screwed'onto the valve, guard which in turn is screwed onto the piston casting, the discharge valve assembly being held infan'intermediate plate disposedbetween thecylinder and the discharge-valve;cover; l 3

Yet a furtherobject"of this invention is to provide a strong, rugged and durablevalveconstructionof the character described, which Shallbe relatively inexpensive to-manufacture, easy to assemble, and which shall yet be practical and efiicient toahig'h-degree in use:

Other objects ofthis invention will in part be obvious and in part hereinafter pointed out;

The invention accordingly" consists in the features of construction, combination of elements, and arrangement of par-ts which will be exei'nplifi'ed in the constructionhereinafter described, and of which the scope or application will be indicated.inthe-following claims. 7.

In the accompanying. drawingg'dnwhich is shown one. :of the variouspossible illustrative embodimentsof thlSiillVGlfltlOl'l',

Fig: lis an axial crossesectional view of suction valve structure-embodying the invention;

Fig. 2, is aview'simil'ar toFig. 1, but illustrating amodifiedccnstruction;

Fig; 3 is a view similar: to Fig. ii of a: discharge SCla ims. (c1. 230--231) 2 and suction valve embodying the invention; and Fig. 4 is a top'plan view of the piston and; valve structures shown in Fig. 2.

.Referring now in detail to the drawing, l0 designates a portion of a suction valve embodying the .invention. Said figure for the purpose of illustration, shows a valve for a vertical's'ingle acting ammonia compressor. The structure l0 comprises a cylinder H and a piston [2. The piston 12 comprises a body or casting I 2a having acylindricalwall I3 formed with a series of external annular grooves M for piston rings I5 which engage the inner surface I la of the cylinder H. I'ntegrally formed with the cylindrical portion I3 of the piston body in are radial webs I l carrying a central boss [8 projecting beyond one end of the body. Between the'webs H are passages I9". At one end of the piston are ground annular concentric surfaces 2! and 22 on the outside and inside, respectively, of the passages 19'. The webs ll are recessed as at 23 between the surfaces 2! and 22..The surfaces 21 and 22 are .in' a common plane perpendicular to the axis of the piston. Boss I8 is formed with external screw threads 24 as shown in the drawing.

Screwed to the boss I3 is an annular valve guard 26. The valve guard 26 has a central internally screw threaded opening 2! engaging the threads 24 of said boss. The valve guard 26 is furthermore formed with an outwardly extending annular flange 28 formed with an inner row of arcuate slots 29 and an outer row of arcuate slots 3!] concentric with respect to the inner row. The central portion of member 26 extends below flange 23 to form a flange 32. It is formed on theunderside thereof with a shoulder 33a. Flange 32 is formed with external screw threads 33 for the purp'osehereinaiter appearing.

Flange 28 is formed on the underside thereof with an annular groove 34 between the slots 29 and 30. Groove 34 has chamfered inner and outersurfaces 35. Flange 28 is furthermore formed with. an annular groove 36 between arouate slots 30 and the outer peripheral edge 31' of said flange. Groove 36 likewise has chamfered inner. and outer surfaces 40. Screwed to the threaded portion 33 of flange 32 is an annular, ring shaped valve seat 42. Valve seat 12 has an annular shoulder 43' contacting shoulder 33a. Valve seat 42 has on the underside thereof annular ground surfaces 45 and 3B contacting the ground surfaces 21' and 22 on the piston body or casting, respectively. Abutting surfaces 3312,43 are also ground. I

JBetween ground surfaces: 35, 46,. valve. seat 42 is formed with a portion 50 projecting between the ground surfaces 2| and 22. The valve seat is furthermore formed with inner and outer concentric circular rows of arcuate passages 52 and 53 aligned with grooves 34 and 36, respectively. It will be noted that the lower edge of flange 32 terminates short of the ground surface 22 so as to provide a space 54 between the valve guard and said surface 22 of the piston casting. On the valve seat are inner and outer concentric circular valve plates 51 and 58. Interposed between the valve plate and the valve guard are valve strip springs 60 and BI projecting into the grooves 34 and 36, respectively. The springs 60 and GI. may be constructed as shown in my copending application Serial No. 589,191, filed April 19, 1945, now abandoned.

The valve guard 26 may be locked to the piston casting by a wire lock 53 of usual construction. The advantages of the above-mentioned construction are: (1) large valve plates can be used giving large passage area with lower valve lift, (2) the assembly is simple and safe, (3) the ground joints make a perfect fit, (4) the valve seat is separated from the piston body, (5) the double ground joint may be easily reground in the field.

The valve seat is first screwed onto the valve guard. The valve guard is then screwed onto the boss I8 until the ground surfaces of the valve seat contact the ground surface of the piston body.

. In Fig. 2 there. is illustrated a modified form of the invention. In Fig. 2 thepiston I2 is likewise formed with a boss I8.- In this construction, a valve seat member I0 is screwed onto the boss I8. Valve seat 10 has an internal screw threaded opening for this purpose. It is furthermore formed with an upwardly extending flange I2 having external screw threads '13. The valve seat 10hason its underside, ground surfaces 14 and I5, contacting the ground surfaces 2| and 22, respectively, of the piston body. Said valve seat I0 is formed with a series of arcual passages I8. On the Valve seat is a valve plate or ring I9.

Screwed to the threaded portion I3 of' flange .12 is an annular guard 80. Valve guard 80 has an outwardlycxtendin-g flange 8| formed with an undersurface 82 spaced from the valve seat. Valve guard80 is formed with a circular row of arcual passages 83. The flange 8| is formed on its underside with an annular groove 84 to receive a valve spring 59 such as s own in my copending application SerialNo. 589,191, filed April 19, 1945. The valve spring is'interposed between the valve plate 19 and said valve guard. The valve seat may be attached to the boss I8 by 'a usual wire lock 85. It will thus ,be understood that in the modification of Fig. 2 the valve seat is screwed directly to the piston casting and the valve guard is screwed onto the valve seat. Here, likewise, the valve seat has a ground joint connection to the piston casting. The underside 89a of the valve guard 80 is ground and abuts a ground surface 100. at the upper side of the valve seat I0.

In Fig. 3 there is shown a suction and discharge valve 90 for an ammonia, vertical, single acting compressor or the like compressor. The construction 90 comprises a cylinder 9| in which there reciprocates a piston I2 similar to the piston construction described above. Screwed to the piston I2 is a Valve guard 92 similar to the valve guard 26 except that it is formed with only one set of passages and one groove on its underside. Screwed to the valve guard 92 is a valve s at 93 similar to valve seat 42 except that it is formed with only one set of passages instead of two sets.

The valve seat has ground surfaces on its underside contacting the ground surfaces of the piston, the same as in Fig. l. The valve guard is locked to the boss I8 by a usual wire lock. On the valve seat is a single annular valve plate 94 and interposed between said valve plate and the valve guard are the strip valve springs 90.

At the upper end of the cylinder is a plate 95 fixed to the cylinder in any suitable way. The plate 95 is formed with an annular opening 96 formed with an enlarged portion 91. Between opening 95 and the enlarged portion 91 is an annular shoulder 98.

Within opening 96 is a valve seat I00 for a discharge valve. Said valve seat has an annular flange contacting shoulder 98 and is clamped by plate 95 to the cylinder body. The valve seat I 00 constitutes an end plate for the cylinder and may be formed with a central countersunk opening IOI,and with two'concentric sets of annularly arranged arcuate passages I02. On the plate 95 is a clamp I03. Interconnecting the valve'seat i'00-and the clamp I03 is a central bolt I04 passing through an opening 'in the clamp, Over the clamp I03 is a cylinder cover I 05. The clamp 'I 03 has a top portion I 05 spaced from the valve seat. Said clamp furthermore has curved legs I01 contacting plate 95. The valve seat I 00 is formed with a recess I00a on its underside to receive the valve-guard'92 when the piston is at the end of its compression stroke. It will be noted that plate I00 is countersunk as at I00b on its underside to receive the head of the bolt I04. Furthermore a nut I04a screwed to the upper end of the bolt serves to press the clamp I06 .down against the plate 95 and holdthe discharge valve securely position.

Screwed to the shank of theflbolt I04 and lnterposed between plate I00 and clamp I06 is a valve guard IIO for the discharge valve. The valve guard H0 is formed with two concentric circular rows of arcuate slots III staggered with respect to the arcuate slots or passages I02. 'The valve guard IIO furthermore has a flange portion II2 spaced above plate or valve seat I00. The flange H2 is formed on its underside with concentric grooves II3 overlying the passages I02. On the valve seat I00 are circular valve plates'or rings II4 overlying the passages I02 and normally closing the same. Interposed between the valve plates I I 4 and the flange II2of valve guard IIO are strip springs II 6 similar to the springs shown in my copending application Serial No. 589,191. The springs IIB project into the grooves H3.

The action of the device will now be understood. As the piston moves downwardly, the discharge valve is closed. However, the suction valve will open to permit passage of gases through the passages 93a in the valve seat 93 and passages 92a ofthe valve guard 92 and the outside circumferential opening of valve plate 94 whichoffers-a large passage area for the enterin gas or fluid. As'the piston moves up toward the upper end of the stroke and the valve plates I I4 will be unseated and the gases will in its upper surfacetransverse to the groove 85a toiadmit :atool form-lifting: out the :wire lock.

It will thus be seen that there-is providedia device in wh ichathe several objects of this invention are achieved, and which is well adapted to meet the conditions of practical use.

;As variouspossible-embodiments might'be made of t-he above invention, an as arious changes might'bemadeintheembodrmef ft above set forth, it is to be understood-thatall"matter herein set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. An annular body formed at its center with an outwardly projecting externally threaded boss and about said boss being formed with openings that are spaced from each other circumferentially of the body and concentric with said body, a valve seat resting upon said body and formed with a centrally located threaded opening through which said boss passes and concentric with its central opening being formed with inner and outer rows of passages spaced from each other circumferentially of the body, an annular valve guard over said body having a central opening surrounded by a sleeve projecting from the guard and being formed with internal and external threads and screwed upon the center boss of the body and into the threaded opening of the valve seat, said sleeve being surrounded by a shoulder bearing against the valve seat and limiting movement of the sleeve through the valve seat, said guard being formed with inner and outer rows 2. A body formed with an outstanding threaded boss and about the boss being formed with openings, a, valve seat formed with a threaded" opening through which said boss passes and about its openin being formed with passages spaced from each other circumferentially, a valve guard over said valve seat formed with an opening surrounded by a sleeve internally and externally threaded and screwed upon the boss and into the opening of the valve seat and having portions spaced from the valve seat and being formed with spring seats over the passages of the valve seat, a valve plate fitting between the guard and the valve seat and normally resting upon the valve seat in closing relation to the passages in the valve seat, and springs seated in the Spring seats and engaging the valve plate and yieldably holding the valve plate in its closed position against the valve seat.

3. A body formed with an outstanding boss and about the boss being formed with openings, a vave seat resting upon said body and formed with passages registering with the openings in the body, said valve seat being formed with an opening through which the boss passes, a valve guard over the valve seat surrounding said boss and detachably connected with the boss, said valve guard having a portion fitting into the opening of the valve seat and detachably coni i-E amps:

6, nected therewith forreniovably hem-ing the valve seat upon said 'body, "said guard having portions spaced-upwardly ffrom the'valveseat and formed with spring sea-ts, closure means for the passages in the valve "seat disposed under the upwardly spaced portions of =the=valve guard and movable into and out of position to rest upon the valve seat andclose its passages, and jsprings 'mounted in the spring seats and engagingthe closure means to yieldably hold the closure means in closed position. 7

4. A body formed with an outstanding boss and with openings about the boss, a valve seat resting upon said body and formed with an opening through which the boss passes and with passages registering with the openings in the body, a valve guard over said valve seat fitting about the boss and having a threaded sleeve screwed onto the boss and into the opening of the valve seat, saidsleeve having its lower end spaced u pwardly from the body, a portion of the guard about the sleeve bearing against, the valve seat and applying pressure to hold the valve seat against the body, there being spaces between the valve guard and the valve seat, and closure means in said spaces normally closing the passages in the valve seat and shiftable upwardly to an open position.

5. A body formed with an outstanding boss and with open ngs about the boss, a valve seat resting upon said body and formed with passages cooperating with the openings in the body, a guard over said valve seat'screwed upon the boss and detachably connected with the valve seat for applying pressure against the valve seat to hold the latter against said body, said guard being formed with spaces over the passages of the valve seat, outwardly opening closures for said passages and spring means for yieldably holding the closures closed over the passages in the valve seat. a

6. A body formed with a boss and with openings aboutthe boss, a valve seat resting upon said body and formed with passages cooperating with the openings in the body, a valve guard over said valve seat formed with spaces above the passages in the va ve seat, said valve seat and said guard being secured to each other and one being secured upon the boss, whereby the valve seat and the guard are removable from the body as a unit and detachable from each other, outwardly opening closure means for the passages mounted between the valve seat and the guard and spring m ans for yieldably holding said closures closed over said passages.

7. A body formed with a boss and with openings about the boss, a valve seat resting upon said body and formed with passages cooperating with the openings, a valve guard resting upon said valve seat and formed with s-oaces over said passages, said valve seat and said guard being detachably connected with each other by a threaded connection, one of said members being screwed upon the boss, whereby the valve seat and the guard are removable from the body as a unit, outwardly opening closure means for said passages mounted in said spaces and spring means for yieldably holding said closures closed over said passages.

8. A piston of a reciprocating compressor having on its working side a coaxial boss and a face concentric with the boss, said face being formed with an opening, the sections of the face on both sides of the opening lying on the same surface, a valve assembly comprising a valve seat 7 member-contacting said faceof the piston on- REFERENCES CITED both Sides of said opening annulafly and a valve The following references are of record in the guard member joined to the valve seat member, file of this patent; said valve seat and valve guard members being centered to each other on mutually contacting 5 UNITED STATES PATENTS surfaces coaxial to the piston, and the valve as- Number Name Date sembly being attached to the piston by engage- 917,793 Rumsey Apr. 13, 1909 ment of one of its members to said boss by means 1,396,079 Warnock Nov. 8, 1921 of ascrew thread. 1,489,912 Winkler Apr. 8, 1924 JOHANN HEINRICH HERMANN 708$. 10 1,650,494 Dally NOV. 22, 1927 

